Type species: Flustra lanceolata Goldfuss, 1826
This genus includes the species:
| Ptilodictya angusta | Hall, 1883 | Silurian Wenlockian | USA Indiana |
| Ptilodictya bifurcata | Brood, 1978 | Ordovician Ashgill | Sweden Gotland |
| Ptilodictya canadensis | Billings, 1866 | Ordovician Ashgill | Canada Anticosti Island |
| Ptilodictya capillaris | Lavrentjeva, 1993 | Ordovician | Lithuania |
| Ptilodictya dichotoma | Portlock, 1843 | Ordovician Ashgill | Ireland |
| Ptilodictya dissecta | Kopajevich, 1975 | Silurian Llandovery | Estonia |
| Ptilodictya ensiformis | (Hall, 1852) | Ordovician, Silurian | Canada, USA |
| Ptilodictya exiliformis | Ernst, 2007 | Ordovician | India |
| Ptilodictya exilis | Lavrentjeva, 1993 | Ordovician | Estonia |
| Ptilodictya expansa | (Hall, 1883) | Silurian Llandovery | USA Ohio |
| Ptilodictya flabellata | Eichwald, 1860 | Ordovician Ashgillian | Estonia, Sweden |
| Ptilodictya flabellatiformis | Kopajevich, 1975 | Silurian Wenlockian | Estonia, Sweden |
| Ptilodictya foliacea | Kopajevich, 1975 | Silurian Llandovery | Estonia |
| Ptilodictya gladiola | Billings, 1866 | Ordovician-Silurian | Canada, Poland, Estonia |
| Ptilodictya gracile | Owen, 1960 | Silurian Ludlovian | Wales |
| Ptilodictya halli | Pushkin, 1990 | Silurian | Belarus |
| Ptilodictya irregularis | Spjeldnaes, 1985 | Ordovician Ashgill | Sweden |
| Ptilodictya lanceolata | (Goldfuss, 1826) | Silurian Llandovery-Wenlock | Netherlands, England, Scotland, Sweden |
| Ptilodictya lineata | Liu, 1980 | Middle Ordovician | China |
| Ptilodictya nebulosa | (Hall, 1874) | Devonian Lochkovian | USA |
| Ptilodictya nitidula | Billings, 1866 | Ordovician Ashgill | Canada Anticosti Island |
| Ptilodictya procera | Pushkin, 1976 | Ordovician Ashgillian | Russia, Mongolia |
| Ptilodictya sulcata | Billings, 1866 | Ordovician Ashgill | Canada Anticosti Island |
| Ptilodictya tenella | Ulrich & Bassler, 1913 | Silurian-Devonian | USA |
| Ptilodictya triangularis | Hennig, 1905 | Silurian Llandovery-Wenlock | Sweden Gotland |
| Ptilodictya viluensis | Nekhoroshev, 1961 | Silurian Llandovery | Russia Siberia |
| Ptilodictya whiteavesi | Ulrich, 1889 | Ordovician Ashgill | Canada |
| Ptilodictya whitfieldi | Foerste, 1895 | Silurian Llandovery | USA Ohio |
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